How to set keyboard indicator light from windows kernel mode driver?

Question

I want to write a kernel mode program that toggles the numlock light on the keyboard when a key is pressed.

I started by modifying the kbfiltr.c provided with the WinDDK samples, using the KbFilter_ServiceCallback routine to intercept a key and I'm trying to send an (IOCTL_KEYBOARD_SET_INDICATORS) by IRP to set the light.

I'm quite new to driver development and I can't find how to code this properly.

Can anyone help out by giving direction to any code examples?

Answer 1

I figured it out with information and source code provided by Microsoft at:

http://support.microsoft.com/kb/326315